# Services from calendar-systems.x402tookit.com on Zero

> calendar-systems.x402tookit.com serves 12 paid API services for AI agents, indexed by Zero. Each is callable per call with payment handled by Zero.

Canonical page: https://www.zero.xyz/host/calendar-systems.x402tookit.com
Live health (JSON, refreshed every minute): https://www.zero.xyz/host/calendar-systems.x402tookit.com/health.json

## Services

- [Calendar Systems – Leap Year Checker](https://www.zero.xyz/c/calendar-systems-leap-year-checker-49c327a1/llms.txt): $0.02/call via x402. Determines whether a given year is a leap year in the Gregorian, Julian, Hebrew, Islamic (tabular), or Persian calendar, and returns the applicable rule plus adjacent leap years.
- [Calendar Systems Moon Phase](https://www.zero.xyz/c/calendar-systems-moon-phase-5fb2e54a/llms.txt): $0.02/call via x402. Returns moon phase name, age in days, illumination fraction, and previous/next lunar event times (new moon, quarters, full moon) for a given date.
- [Calendar Systems – Chinese Zodiac Lookup](https://www.zero.xyz/c/calendar-systems-chinese-zodiac-lookup-afe6e7a2/llms.txt): $0.02/call via x402. Returns the Chinese zodiac animal, element, yin/yang polarity, sexagenary cycle info, and Chinese New Year date for a given Gregorian year or date (table coverage 1901–2100).
- [Hebrew Calendar Converter](https://www.zero.xyz/c/hebrew-calendar-converter-d8af2c5e/llms.txt): $0.02/call via x402. Convert a Gregorian date to the Hebrew calendar (or vice versa), returning the Hebrew date, month name, year type, leap year status, and major holidays for that Hebrew year.
- [Calendar Systems – Julian Day Calculator](https://www.zero.xyz/c/calendar-systems-julian-day-calculator-e4f2a0b3/llms.txt): $0.02/call via x402. Converts a Gregorian or Julian calendar date and UTC time to Julian Day (JD), Modified Julian Day (MJD), and Julian Day Number (JDN), or converts a JD number back to a calendar date.
- [Calendar Systems – Solstice & Equinox Moments](https://www.zero.xyz/c/calendar-systems-solstice-equinox-moments-f9218167/llms.txt): $0.02/call via x402. Returns the exact UTC moments of the March equinox, June solstice, September equinox, and December solstice for any Gregorian year from 1900 to 2100, along with season lengths in days.
- [Calendar Systems – Gregorian to Islamic Tabular Civil Calendar Converter](https://www.zero.xyz/c/calendar-systems-gregorian-to-islamic-tabular-civil-calendar-converter-155cf0cc/llms.txt): $0.02/call via x402. Converts a Gregorian date to the Islamic tabular civil calendar date (or vice versa), returning month name, leap year status, observances, and a disclaimer that this is a calculated approximation, not based on moon sighting.
- [Calendar Systems – Day of Week & Date Info](https://www.zero.xyz/c/calendar-systems-day-of-week-date-info-94f18116/llms.txt): $0.02/call via x402. Returns the weekday, day of year, quarter, ISO week, and ISO week-date for any date from year 1 to 9999, supporting both Gregorian and Julian calendars.
- [Calendar Systems – Gregorian / Julian Date Converter](https://www.zero.xyz/c/calendar-systems-gregorian-julian-date-converter-346ec136/llms.txt): $0.02/call via x402. Converts a date between the Gregorian (New Style) and Julian (Old Style) calendar systems, returning both dates and the day difference between them.
- [Persian Solar Hijri Calendar Converter](https://www.zero.xyz/c/persian-solar-hijri-calendar-converter-a4e1a2cd/llms.txt): $0.02/call via x402. Converts a Gregorian date to the Persian Solar Hijri calendar (or vice versa) using the astronomical Nowruz rule, covering years 1901–2100.
- [Calendar Systems Moon Calendar](https://www.zero.xyz/c/calendar-systems-moon-calendar-9a55ae8f/llms.txt): $0.02/call via x402. Returns all lunar phase events (new moon, first quarter, full moon, last quarter) for a given month in UTC, with exact times and a blue-moon flag.
- [Calendar Systems Age Profile](https://www.zero.xyz/c/calendar-systems-age-profile-b04ac50d/llms.txt): $0.02/call via x402. Returns a comprehensive age profile for a birth date including years/months/days lived, Korean/East Asian ages, next birthday with leap-day handling, and Chinese zodiac.

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

- [Zero catalog index](https://www.zero.xyz/llms.txt)